Drafting instrument.



W. C. VAN GILDER.

DRAFTING INSTRUMENT.

APPLICATION FILED SEPT. so, 1910.

Patented Nov.

Z SHEETS-SHEET 1.

COLUMBIA PLANOGRAPH Co.,w^sMlNGToN. D. c.

W. C. VAN GILDER.

DRAFTING INSTRUMENT.

APPLICATION FILED SEPT. so, 1910.

Patented Nov. 7,' 1911.

2 SHEETS-SHEET 2.

CDLUMBIA PLANOGRAPH 0., WASHINGTON. D. c.

WAYNE C. VAN GILDER, OF HAMMOND, INDIANA.

DRAFTING INSTRUMENT.

Specification of Letters Patent.

Application filed September 30, 1910.

Patented Nov. '7, 1911.

Serial N0. 584,660.

To all whom it may cof/wem:

Be it known that I, WAYNE C. VAN Girone, a citizen of the United States, residing at Hammond, in the county of Cook and State of Indiana, have invented new and useful Improvements in Drafting Instruments, of which the following is a speciiication.

This invention relates to drafting instruments and designs more particularly to provide an instrument for laying out elbow patterns, T patterns and other patterns for angular joints for pipe or other conduits.

The object of this invention is to provide a comparatively simple and inexpensive instrument which may* be readily adjusted for any given size of pipe, within predetermined limits, and being provided with a flexible edge which, when the parts are properly adjusted, assumes a regular part of the desired curve used in laying out the pattern.

To such end this invention consists in a draft-ing instrument having two angularly disposed members, relatively movable with respect to each other, and adapted to be locked together against relative movement at various positions with respect to each other, and a iieXible element secured to one of said movable members and guided on the other member and arranged to be sprung into a curve of given direction by the adjustment of one of the members upon the other.

The invention further consists in the several novel features of construction and arrangement set forth in this specification and more particularly pointed out in the claims appended hereto.

The invention is clearly illustrated in the drawings furnished herewith in which Figure 1 is a plan of an instrument embodying my present invention, Fig. 2 is an edge view thereof looking in the direction of the arrow 2, in Fig. 1, Fig. 3 is a plan, viewed from below, of a slide, with certain portions broken out to show parts which would otherwise be hidden from view, Fig. 4 is an end view of said slide, Fig. 5 is an end view of one of the relatively movable members of the instrument, the view being taken in the direction indicated by the ar- 7 is a detail, vertical section taken on the line 7 7 of Fig. 1, Fig. 8 is a horizont-al section taken on the line 8 8 of Fig. 7, Fig. 9 is a vertical section taken on the line 9 9 of Fig. 8, Fig. 10 is an end view of one of the relatively movable members showing a certain clamp, the view being taken in the direction of the arrow 10, in Fig. 1, Fig. 11 is a detail, horizontal section taken on the line 11 11 of Fig. 10, Fig. 12 is a side view of an elbow, Fig. 13 is a view of a pattern drafted with the instrument.

Referring to said drawings, two relatively movable members A, B, will be seen in Fig. 1, said members being adjustably connected together by a slide C, which may be clamped to either or bot-h of said members, as desired.

The member A, is preferably in the form of a bar 10, of suitable length, having linear divisions upon its edges. The member A, bears a second set of graduations 11, which may be arranged upon a second bar 12, preferably narrower than the bar 10, and

raised above the same, as by struts 13. This peculiar construction is not material to my invention, broadly considered, but the raised bar 12, provides a convenient means for receiving and guiding the slide C; said slide C in such case being provided with ribs 15, having overhanging flanges 14, adapted to overhang the edges of the bar 12, which project beyond the struts 13. The edges 15a, of the ribs 15, are parallel and fit against the side edges of the raised bar 12, so that the slide may move in a perfectly straight line along the same. A convenient means for clamping the slide upon the member A, comprises an eccentric clamp 16, mounted upon a pin 17, and having a finger piece 18, projecting beyond the slide C, which at this point is formed into a curved or arc shaped extension 19, projecting beyond the main body thereof. One rib 15, is slit to forma tongue 20, against which the eccentric clamp 16, bears and by turning the handle 18, in the direction indicated by the arrows in Figs. 1 and 3, the slide may be clamped to the bar 12, of the member A, the eccentric clamp securing to the slide.

the bar 12, tightly between the tongue 20 and opposite edge 15a.

The member B, lies at right angles to the member A, and is slidably mounted in the slide C, whereby it may be adjusted into various positions at right angles to the member A. The slide is slotted horizontally above the ribs 15, as at 21, to receive the member B, and said member B, is guided between the opposite edges of downwardly projecting ribs 22, 23, of the slide C, the edges of said ribs being made perfectly true and at right anglesto the edges 15a of the ribs 15, whereby the member B, may be held absolutely at right angles to the member A, at all times while the pair are connected together by the slide C. If desired the rib 23, may be slit to form a tongue 24, and an eccentric clamp 25, may be mounted upon the pin 17, to clamp the member B,

The construction of the eccentric clamp 25, is similar to that of the eccentric clamp 16, but it is to be understood that this particular kind of clamping means is not essential to my invention broadly considered, as any well known equivalent clamping means may be employed to clamp the members A, B, together.

Detachably secured upon the working end b, of the member B, is a flexible element D, which as shown in the drawing comprises a bar or strip of flexible metal, preferably steel. Said bar is detachably secured upon the working end of the member B, by a clamp, here shown as comprising a head. 27 fast on the end of the member B, a ianged clamping plate 26, spaced away from the head 27, by a strut 28, and held in place by screws 29. The flanged clamping plate 26, is preferably provided with overhanging anges 30, so as to provide a seat for the strut 28, and bar D, and a set screw 31, is threaded in the head 27, and bears upon the outer face of the flanged clamping plate 26, to clamp the bar D, in place. If desired the bar may be slotted as at dx, to receive the threaded shank of the set screw 31. The construction just described furnishes a simple clamp for securing one end of the flexible element D, in place upon the working end of the member B, but it is perfectly obvious that otherA well known forms of clamping means may be used wit-hout departing from the spirit of my invent-ion.

The fiexible element D, slides in a guide E, located at one end of the member A, the object being to maintain any point on the edge d10, of the flexible element at the Zero point of scale 1. Said guide is preferably in the form of a clamp secured upon one end of the member A, and as shown said clamp has a vertically extending lug 32, the corner 33, of which is arranged on the edge a, of the member A, and at the zero point of the scale 1. Extending up from the member A, is a vertical support 34, in which is guided a clamping head 35, as by overhanging flanges 36, formed on the support 34. The working end 37, of said head 35, is arranged to engage with the side of the flexible element D, and to hold said element tightly against the corner 33, of the lug 32. The means for adjusting said head 35, is shown to comprise a set screw 38, threaded in an internally threaded tubular member 39, stationarily secured to the member A, as by soldering or rivet-ing it to the support 34. The screw 38, is connected to the head 35, as by a link 40, which may be fastened to the head 35, as by a screw 41, and which extends into a socket in the screw 38, where it is provided with a reduced neck 42, in which seats a pin 43, secured in the screw. This particular construction permits the screw to be turned to adjust it along its support 39, without turning the link 40. The screw is provided with an ordinary head by which it may be turned by hand to move the clamping head 35, into or out of engagement with the fiexible element D. It is to be observed that while this construction forms a very simple guide and clamp, other equivalent devices may be substituted for it.

The marks, respectively designated by numerals 1-2 etc. on the scale 11, which numerals indicate pipe diameters in inches, are each located at a distance from the zero point on the scale, equal to the numeral multiplied by 3.1416 divided by 4 inches. The member B is shown as set at 10 on the scale 11, for drawing a pattern in which the diameter of each elbow section is 10 inches. The distance of the point 10 away from the Zero point on the scale 11, is equal to ten inches times 3.1416 divided by 4; in other words it is equal to one fourth of the circumference of a circle whose diameter is 10 inches.

The member B, is provided with a number of scales or graduations al, d1, d2, d, (Z4, d5, which determine the highest point of the curve; namely the point on the pattern; said scales may be determined as follows: In the three piece elbow shown in Fig. 12, a base line 5 5, is drawn which intersects the meeting line between two sections of the elbow, at its middle point. The distance between the point and the base line is equal to the proper distance between the point X on the member B, and the edge a, of the member A. This distance is graduated into slnaller divisions corresponding in number to the divisions on the scale 11. The scales for 4 piece patterns, 5 piece patterns etc., are determined in the same way from drawings of 4 piece elbows, 5 piece elbows etc. Inasmuch as the edge c1 of the slide is set back from the edge a, the zero points of the scales d, d1 etc. are set back a distance from the point X equal to the distance between the edges a-cl. The divisions of the scales d, d1, etc. indicate pipe diameters in inches, as do the divisions on the scales 11.

Along the edge 44, of the member B, is a scale 45, arranged in inches and said edge 44, registers with the edge c, of the slide C. rIhe end of flexible element I), lwhile held by the clamp, lies at right angles to the edge 44, of the member B, and some point in its length passes the Zero point on t-he scale 1. By reason of this fact and by reason of its flexibility, said flexible element will assume the correct curve or line for drafting the curved edges of elbow, T patterns or other like patterns.

In operation the slide C, and member B, are adjusted along the member A, until the edge c, and edge 44, are brought into register with the dimension point upon the scale 11, indicating the diameter of the elbow pattern or other pattern which it is .desired to lay out. The eccentric clamp 16, is then moved over to clamp the slide in place on the member A.. Vlhe member B, is then adjusted in the slide C, bringing the same dimension point thereon, as is used on the scale 11, into register with the edge c1. This depends upon the number of pieces required to make the given elbow. The slide C, has numerals upon its edge c1, indicating the scale to be used for three piece elbows, four piece elbows etc., up to eight piece elbows. If a three piece elbow is to be drafted, the scale marked 3 is used; if four piece the scale 4 is used and so on. Vfhen t-he member B, has been brought to the proper position in the slide C, the eccentric clampQt'), is moved over to clamp said member in place in the slide. The flexible element having been flexed by the movement of the member B, automatically assumes the proper curve for drawing one fourth of the curve of t-he pattern. The adjustment screw 38, is now clamped in place to secure the drawing edge d10, in engagement with the corner 33, of the lug 32.

In using the instrument, a base line but) (see Fig. 13) is first drawn on the paper and the instrument placed thereon with the edge a, of the member A coincident with the base line and the curve O struckalong the outer or marking edge of the bar D, said curve intersecting with the base line at a2, and with a vertical line a; e, (coincident with the edge 44 of the member B,) at The instrument is then inverted, bringing the edge 44, along the vertical line a e', and the edge a, on the base line 5 5, and the line Ol, drawn; said line intersecting with the base line at a5. One-half of the curved line is now complete and the other two quarters may be completed by reversing the instrument and drawing the lines O2, O3. One

half of the line drawn indicates the line O4, on the elbow shown in Fig. 12, and the other half is on the opposite side of the elbow.

From the above it is quite evident that the usual task of laying out the curve described in Fig. 13, is overcome. The device is extremely simple, accurate and efficient for the purpose for which it is intended.

I realize that various alterations and modifications of this device are possible without departing from the spirit of my invention, and I do not therefore desire to limit myself to the exact, form of construction shown and described.

I claim as new and desire to secure by Lettersa Patent 1. In a drafting instrument the combination of two connected, angularly disposed, relatively adjustable members, each having a straight edge disposed at rightangles to the other, a flexible element secured to one member at right angles thereto, and a guide secured upon the other member, and having a guiding edge located at a fixed point on the straight edge of said other member and arranged to guide the flexible element across said fixed point, substantially as and for the purpose set forth.

2. In a drafting instrument, the combination of two relatively adjustable members, each having a straight edge disposed at right angles to the other, a slide having two guideways disposed at right angles to each other, for receiving and guiding said adjustable members, clamping means 'associated with said slide for clamping said adjustable members in place, a spring steel bar detachably secured to one of said members to extend at right angles thereto, and a guide having a guiding edge located at a fixed point on the straight edge of the other member and arranged to guide said spring steel bar across said fixed point on the straight edge.

3. In a drafting instrument, the combination of two relatively movable members, each having a straight edge arranged at right angles to theother, and one member having graduations thereon representing diameters, and the other member having a plurality of sets of graduations thereon, in fixed proportion to the first mentioned graduations, substantially as described, a slide for connecting said members together, a flexible, spring steel bar secured to the second named member at the zero end of the graduations thereon and extending at right angles to said member, and a guide secured to the first named member at the zero point of the graduations thereon, and arranged to guide the steel bar across the straight edge thereof at the Zero point thereon.

4. In a drafting instrument, the combina tion of two connected, angularly disposed,

relatively adjustable members, each having a straight edge disposed at right angles to the other, a flexible element secured to one member at right angles thereto, and a guide. 5 secured upon the other member, and having a guiding edge located at a fixed point on the straight edge of said other member and arranged to guide the flexible element across Said fixed point, said guide having a Clamping 10 plate arranged to bear against the flexible element to hold the same in place and a set screw for pressing the plate against said flexible element.

In Witness whereof I have hereunto signed my name at Hammond, Lake county, Indi- 15 ana, this 28th day of September 1910.

WAYNE C. VAN GILDER.

Witnesses MIL@ M. BRUCE, CHARLES O. SHERVEY.

Copies of this patent may be obtained fol` five cents each, by addressing the Commissioner of Patents,

,Washingtom D. C. 

